package org.apache.commons.jelly.tags.quartz;
/*
* $Header: /home/cvs/jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/tags/quartz/QuartzTagSupport.java,v 1.2 2002/08/04 06:38:45 jefft Exp $
* $Revision: 1.2 $
* $Date: 2002/08/04 06:38:45 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999-2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Commons", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
import org.apache.commons.jelly.TagSupport;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.impl.StdScheduler;
import org.quartz.impl.StdSchedulerFactory;
/** Basic support for all tags requiring a Quartz scheduler.
*
* @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a>
*/
public abstract class QuartzTagSupport extends TagSupport
{
/** The scheduler variable name in the JellyContext. */
public static final String SCHED_VAR_NAME = "org.apache.commons.jelly.quartz.Scheduler";
/** Retrieve or create a scheduler.
*
* <p>
* If a scheduler has already been created an installed
* in the variable {@link #SCHED_VAR_NAME}, then that scheduler
* will be returned. Otherwise, a new StdScheduler will be
* created, started, and installed. Additionally, a runtime
* shutdown hook will be added to cleanly shutdown the scheduler.
*
* @return The scheduler.
*
* @throws SchedulerException If there is an error creating the
* scheduler.
*/
public Scheduler getScheduler() throws SchedulerException
{
Scheduler sched = (Scheduler) getContext().getVariable( SCHED_VAR_NAME );
if ( sched == null )
{
StdSchedulerFactory factory = new StdSchedulerFactory();
final Scheduler newSched = factory.getScheduler();
sched = newSched;
getContext().setVariable( SCHED_VAR_NAME,
newSched );
Runtime.getRuntime().addShutdownHook(
new Thread() {
public void run()
{
try
{
if ( ! newSched.isShutdown() )
{
newSched.shutdown();
}
}
catch (SchedulerException e)
{
e.printStackTrace();
}
}
}
);
newSched.start();
}
return sched;
}
}